1. This mountain bike crank locking screw features an integrated hollow crank fixing design and is made of metal, ensuring reliable quality. It is suitable for male, female, and users without specific gender preferences, appealing to a wide range of audiences. 2. The specification is M6x18 per set, with each set containing 2 pieces, which can meet the requirements for fixing the bike crank. Whether you are riding for daily commuting or going on a mountain adventure, it can provide a stable locking effect for your bike's crank, making your ride safer and smoother. 3. This product has an authorized in - house brand. Although it is not an imported product, its quality is comparable. It is not designed for children and is a suitable accessory for adult mountain bikes. 4. It is favored by consumers in many regions around the world. The main sales areas include Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East. It is also popular on many major e - commerce platforms, such as eBay, Amazon, Wish, AliExpress, independent websites, Lazada, and Shopee.